package com.dhl.facade;

/**
 * @title: Screen
 * @Author danghailiang
 * @Date: 2022/8/10 8:04
 * @Version 1.0
 */
// 屏幕
public class Screen {
    private static Screen instance = new Screen();

    private Screen(){}

    public static Screen getInstance(){
        return instance;
    }

    public void up(){
        System.out.println("收取屏幕");
    }
    public void down(){
        System.out.println("放下屏幕");
    }
}
